Inside pipe cutter



y 19,1931- H. J. DENNEY INSIDE PIPE CUTTER Filed July 18. 1930 2 Sheets-Sheet l 5 a EM m v I 5, 3mm

2 v l 3 7 9 4 1v4 5 U 0 LI x 5 x Q m-. 4 2 m I M y H. J. DENNEY ,805,515

' INSIDE PIPE CUTTER Filed July 18, 1950 2 Sheets-Sheet 2 r-Z as 5 J I56 44 iii:

Y V 33 5a gwuentu W Patented May 19,1931

ARV Y a.-1 EnNEY;or wnsr aixn, ouisiana INSIDE PIPE CUTTER Application filed my 18, 1930. Seria1 Io.' 468, 869.

This invention relates tonew'and' useful improvements-in anvinside pipe cutter. Q

- One objectof the inventionisxto provide a pipe cutter embodying aj;.body, having a cylindertherein, with radiallymovable cut-i I ters in hearings in the body and a inandrel fitted in the cylinder and operatively con' nected with the cutters and operative to pro ject the cutters outwardly int'o cutting po-:

1 sition or'to withdraw said cutters, said mandrel being operatable in one direction "by a yieldable member to withdraw" the cutters and in another direction by fluid pressure beneath the mandrel to actuate the cutters out wardly in cutting relation with theypipe to be severed, said cutter embodying also means operableby fluid pressure for anchoring .the cutter in the pipe during'the cutting 0peratiOIl/ 1 y y V Another object of the invention is to provide a device ofthe characteradescribed embodying -means adapted to engage "with the s severed section whereby said sectionmaybe dislodged and withdrawnwith the tool from the bore.

With the above and other objects in View this invention has particular relation to cert-e tain novel features of construction, operation and arrangement of parts an example of;

'view of'upper intermediate and lower see,

tions, respectively, of the ,cuttingitooL t Figure 4 shows a cross sectional svie'wtaken on the line 4-4: of Figure 1'. s a f Figure 5 shows a cross sectionalviewtaken' j a j on the line 55 of Figu 3 i I anchoringthe cutter in the pipe to be Icut.

Figure 7 shows a vertical sectional V18W;Of

the pulling device adapted to be attachedlto the lower end of the cutting tool and anchoring means of Fig. 6, and s V I I Figure 8 showsa sectionalview thereofon the-line 88 of Figure V7. p 7 a Referring now more particularly to the drawings wherein like numerals of reference Figure 6 shows a vertical sectional iview disclosinga modified form, of the meansxfor.

designate similar parts in each of the figures the numeral 1 designates the cutter body, which is tubular in form having the inside cylinder 2 with the radiating cutter bearings 3, radially disposed therein. Attached to the upper end of the bodythreis an operat- I ing StI'lDg'QfPiPGA. Fitted in the cylinder there is anelongated mandrel 5 whose lower end is fitted withsuitable cup rings 6 which fitclosely'in the cylinder and form in efiect, 6 a plunger. Screwed into the upper part of the cylinder there is athimble 7 and withinthis thimble there is a coil spring 8 which is interposed'betwe'en the outward end of the thimble and the upper end: of the mandrel. 6 The end of the mandrel'ad jacent the spring. carries a pin 9 which is surrounded by said spring. Themandrelfis actuated in one di-" rection by said spring/and the other direction by zfluiid pressure, as hereinafter ex- 7 plained. ,The lower end of the cylinder has 1 theinwardly-extending annular flange 10 against which thelower end of'ithe plunger is adapted'to abut. The mandrel has the externalupwardlyfconverging grooves 11v and the bottom of these grooves have the lengthwise dovetailed tenons 12. "There are: the radial cutters 13 in the bearings whose inner endshave dovetailed mortises 14 whichreceive the;correspon'dingntenons 12; The body v'hasthe longitudinal, channels 15 leading from the upper to the lower end thereof andwhich isarrangedaround the cylinder 2.

'Attachedito the lower end oi-the body 1 i I there isatubularsectionl6 whose lower end I, is thickened inwardly forming the bearing 17 andtheupper andlower internal annular shOulders18y19. I v

The numeral 2O designatesfa connecting nipple whose upper end is reduced forming. thetubular spindle 21 which 1 extends up through the bearing 17 and screwed onto the upper'en d of the spindle'is the nut 22 into which isthreaded the gland 23. v Interposed 795 between the 22 and'the shoulder-18 are thebearing rings 24. The reduction ofthe nipple-2O forms the external shoulders- 25, v 26 thereon,,the former of which abut-ethe' lower end of the section 16 and between the shoulder 19 and 26 are the antifriction bear-- ings 27 Connected to the lower end of the nipple 20 there is a tubular body 28 having the cylinder 29 therein, in which is the reciprocable plunger 30 whose upper end is equipped with the cup rings 31 and connected to the lower end of the body 28 is a guide point 32 in. which is located a coil spring 33 on which the plung er 30 is seated. The plunger 30 and the guide point 32 have the aligned axial channels 34, 35 through which fluid may be admitted'into the pipe 36 to be pulled so as to wash out.

said pipe beneath the tool if necessary. The

c linder body 28 has the radial slots 37- t rough which the pipe engaging jaws 38 work.

The inner ends of these jaws have the dovetailed tenons 39 which work in corresponding upwardly diverging mortises 40 inthe plungper 30.

Inoperationthe cutting tool may beassembled as shown in Figures 1, 2 and 3 and let 7 down into the pipe 36 to he cut, to the desired point and fluid under pressure may be forced down through the string 4 passing down through the channels 15 beneaththe plunger 5 The fluid under'pressure will operate to si multaneously force the plunger 5 upwardly, whichin turnwillzoperate to force the cutters 15-outwardly into engagement'with the pipe, andztoforce the plunger 30 downwardly and carry the jaws 38 outwardly into engagement with said pipe. The CUttiIlgtOOl will thus be anchored against longitudinal movement relative to the pipe 36 duringthe cutting operation and'the string 4 may then be rotated with the cutters 13 held against the pipe'until the pipe has been severed by them. The pressure'may then be relieved and the spring 8 will force the plunger 5 downwardly towithdrawthe cutters 13 and-the spring 33 will operate to elevate the plunger 30 to withdraw thejaws 38 from said pipe to permitf the withdrawal of the tool. If desired a ipe'puller suchas shownin Figures 6 and may be assembled with the cutter andthe severed section may be engagedby said puller and withdrawn from the bore as the cutter is withdrawn, This pipe puller will now be described. It comprisesa tubular body 41-.

and when thepuller is employed the guide point .32 will be attached to the lower end of said body 41, as shown in Figure 7,and the upper end of the-body 41 will be connected directly to the lower end of the body 28.

The body 41 is tubular having the cylinder 42 there'in, in which there is provided a spider- 43 forming a support for the spring 35. Reciprocable in the cylinder 42 is the plunger 44 whose upper end is equipped with the cup rings 45 and this plunger42 has an axial channel 46 therethrough from end to end to permit fluid to pass downwardly and out throughthe channel 35 intothe pipe beneath.

The plunger 44 is seated on the spring 47 which is confined in the guide point 32. The body 41 has a plurality of downwardly flared faces 48 on which the pipe engaging jaws 49 are mounted to slide and these jaws have longitudinal bearings 50 on the guide rods 51. The upper ends of these rods are connected to the body 41 and their lower ends abut the upper-end of the guide point 32. The outer surfaces of the jaws 49 are arcuate and toothed so as to engage the pipe 36 and their inner sides have the lengthwise tenons 52 which work through the oblong slots 53 in the body 41 and fit snugly in the mortises 54 of the plunger 44.

During the cutting operation the fluid under pressure will also operate against the.

has been severed and the pressure relieved.

as above explai'ned'the spring 47'will operate to elevate the plunger 44 and this will carry. the jaws 49 upwardly and inwardly out of engagement with the pipe. The entire tool' may then be elevated until the jaws49 are located within the severed section, and pressure again applied which will operate as above described to carry the jaws 49 into engagement with the severed section and an upward pullmay-then be exertedthrough'the operating st-ring 4 to dislodge the said severed section andthe same may then be pulled out.

If the severed section can not be pulled the pressure may be relieved and thedevice loweredto release the jaws 49 and the spring 47* will then operate to again elevate the plunger 44 and carry the jaws 49 upwardly and inwardly, as explained, out of engagement with the pipe, and thetool 'may thenbe withdrawn or relocated in the'pipe tomake anothercut.

While I have shown what I now consider to be the preferred form ofthe invention it is obvious that mechanical changes may be made therein and equivalents substituted for the parts shown and I reserve the right to make such mechanical changes and substitutions as may be found desirable within theprinciple of the invention.

1. A device for cutting and removing pipe from'a wellbore comprising a tubular cutter body, outwardly movable cutters therein, an anc oring device having a 'swivelling' connection' with I the body, outwardly movable anchoring jaws therein adaptedto engage thepipe-toanchor the cuttingmeans against longitudinal movement in the pipe during from a well bore comprising a tubular cutter body, outwardly movable cutters therein, an anchoring device having a swivelling connection with the body, outwardly movable anchoring jaws therein adapted to engage the pipeto anchor the cutting Vmeans against longitudinal movement in the pipe during 7 cutting operations, separate means operatably connected with thecutters and jaws, re-

spectively, and adapted to be actuated, simul- I taneously, by fluid pressure to move the cutters and jaws outwardly into active position in engaging relation with the pipe, a

embodying outwardly movable means, means operatable by said pressure and efi'ectlve to move said pulling means into be-actuated simultaneously by fluid pressure to move the cutting, means and anchoring means outwardly into active position in engagingrelation with the pipe, a pulling device connected to said anchoring device and pulling active position in engagement with the pipe. Intestimony whereof I have signed my name to this specification.

HARVEY J. DENNEY.

pulling device connected to said anchoring;

device and embodying outwardly movable pipe pulling jaws, means operatable by said pressure and effective to move said pulling jaws into active position in engagement with the pipe and yieldable means normally tending to withdraw said cutters and jaws into inactive position out of suchengaging relation with the pipe.

3. A device for cutting and removing pipe 1 from a well bore comprising a tubular cutter body, outwardly movable cutters tlirein, an 7 anchoring device having a swivelling con-. nection with the body, outwardly movable anchoringjaws therein adapted to engage the pipe to anchor the cutting means against longitudinal movement in the pipe during cutting operations, separate means operatably connected with the cutters and jaws, respectively, and adapted to be actuated, simultaneously, by said pressure to move the cutters and jawsoutwardly into active posidevice and embodying outwardly "movable j pipe pulling jaws, means operatable by sald pressure andeflectiveto move said pulling tion inengaging relation with the pipe, a pulling device connected, to said anchoring.

jaws into active positioniin engagement with g the pipe, said cutting and removing device having a longitudinal fluid channel there I throu h. v

4. device for cutting? and removing pipe from a well bore comprising] a cutter body,

outwardly movable cutting means thereiman anchoring device having a swiveling connection with the body, outwardly 'movable anchoring means therein adapted to engage the I pipe to anchor the cutting means against longitudinal movement in the pipe during cutting operations, separate means operatably connected with the cutting means and anchoring means respectively and adapted to 

